Expansible chamber type > Pressure responsive distributor opened responsive to pumping member position > Distributor in piston > Including means to open distributor in fixed chamber wall > Patents

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Class Information
Number: 417/445
Name: Pumps > Expansible chamber type > Pressure responsive distributor opened responsive to pumping member position > Distributor in piston > Including means to open distributor in fixed chamber wall
Description: Apparatus in which the expansible chamber pump is additionally provided with valve means located within a fixed wall portion of the pump chamber forming means (e.g., cylinder), said valve means being of the type which normally opens or closes responsive to a pressure differential between the pump chamber and an inlet or discharge conduit for cyclically controlling pump fluid for the pumping operation and including means operable as a result of the pumping member being moved to a given position in the pump chamber for moving said valve to open position irrespective of said pressure differential.

Patents under this class:

Patent Number	Title Of Patent	Date Issued
6935846	Dosing pump	Aug. 30, 2005
6347668	Relievable check valve assembly for oil wells and water wells	Feb. 19, 2002
5382142	Wall pump having backwash valve actuator	Jan. 17, 1995
5141411	Center-anchored, rod actuated pump	Aug. 25, 1992
4147476	Pump assembly for an atomizing piston pump	Apr. 3, 1979